package com.zpedku.sell.service.impl;

import com.zpedku.sell.converter.OrderMaster2OrderDTOConverter;
import com.zpedku.sell.dto.CartDTO;
import com.zpedku.sell.dto.OrderDTO;
import com.zpedku.sell.entity.OrderDetail;
import com.zpedku.sell.entity.OrderMaster;
import com.zpedku.sell.entity.ProductInfo;
import com.zpedku.sell.enums.OrderStatusEnum;
import com.zpedku.sell.enums.PayStatusEnum;
import com.zpedku.sell.enums.ResultEnum;
import com.zpedku.sell.exception.SellException;
import com.zpedku.sell.repository.OrderDetailRepository;
import com.zpedku.sell.repository.OrderMasterRepository;
import com.zpedku.sell.service.OrderService;
import com.zpedku.sell.service.ProductService;
import com.zpedku.sell.utils.KeyUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author yalith
 * @Time 2018-2018/7/2-15:35
 */
@Slf4j
@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private ProductService productService;

    @Autowired
    private OrderDetailRepository orderDetailRepository;

    @Autowired
    private OrderMasterRepository orderMasterRepository;


    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {
        String orderId = KeyUtil.genUniqueKey();
        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);
//        ArrayList<CartDTO> cartDTOList = new ArrayList<>();
        //1.查询商品(数量,价格)
        for (OrderDetail orderDetail : orderDTO.getOrderDetailList()) {
            ProductInfo productInfo = productService.findOne(orderDetail.getProductId());
            if (productInfo == null)
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIT);

            //2.计算总价
            orderAmount = productInfo.getProductPrice()
                    .multiply(new BigDecimal
                            (orderDetail.getProductQuantity())).add(orderAmount);

            BeanUtils.copyProperties(productInfo, orderDetail);
            orderDetail.setDetailId(KeyUtil.genUniqueKey());
            orderDetail.setOrderId(orderId);
            orderDetailRepository.save(orderDetail);
//            CartDTO cartDTO = new CartDTO(orderDetail.getProductId(), orderDetail.getProductQuantity());
//            cartDTOList.add(cartDTO);
        }
        //3.写入订单数据库(ordermaster)
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());
        orderMasterRepository.save(orderMaster);

        //4.扣库存
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().map(e -> new CartDTO(e.getProductId(), e.getProductQuantity()))
                .collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);

        //TODO 发送异步消息

        return orderDTO;
    }

    @Override
    public OrderDTO findOne(String orderId) {
        OrderMaster orderMaster = orderMasterRepository.findOne(orderId);
        if (orderMaster == null)
            throw new SellException(ResultEnum.ORDER_NOT_EXIST);
        List<OrderDetail> orderDetailList = orderDetailRepository.findByOrderId(orderMaster.getOrderId());
        if (CollectionUtils.isEmpty(orderDetailList))
            throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST);
        OrderDTO orderDTO = new OrderDTO();
        BeanUtils.copyProperties(orderMaster, orderDTO);
        orderDTO.setOrderDetailList(orderDetailList);
        return orderDTO;
    }

    @Override
    public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) {
        Page<OrderMaster> page = orderMasterRepository.findByBuyerOpenid(buyerOpenid, pageable);

        List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(page.getContent());

        return new PageImpl<OrderDTO>(orderDTOList, pageable, page.getTotalElements());
    }

    @Override
    public OrderDTO cancel(OrderDTO orderDTO) {
        OrderMaster orderMaster = new OrderMaster();

        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【取消订单】订单状态不正确,orderId={}, orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus());
            throw  new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.CANCEL.getCode());
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster upResult = orderMasterRepository.save(orderMaster);

        if(upResult ==null){
            log.error("【取消订单】更新失败,orderMaster",orderMaster);
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }

        //返回库存
        if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList())){
            log.error("【取消订单】订单无商品详情,orderDTO",orderDTO);
            throw new SellException(ResultEnum.ORDER_DETAIL_EMTITY);
        }
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream()
                .map(e -> new CartDTO(e.getProductId(), e.getProductQuantity()))
                .collect(Collectors.toList());

        productService.increaseStock(cartDTOList);

        //如果已经支付,需要退款
        if (orderDTO.getPayStatus().equals(PayStatusEnum.SUCCESS.getCode())){
                //TODO 退款没写 2018-7-1 yalith

        }



        return orderDTO;
    }

    @Override
    public OrderDTO finish(OrderDTO orderDTO) {
        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【完结订单】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //修改订单状态
        orderDTO.setOrderStatus(OrderStatusEnum.FINISHED.getCode());
        OrderMaster orderMaster = new OrderMaster();
        BeanUtils.copyProperties(orderDTO,orderMaster);
        OrderMaster updateResult = orderMasterRepository.save(orderMaster);
        if(updateResult==null){
            log.error("【完结订单】更新失败 orderId={}, orderStatus={}",orderMaster.getOrderId(),orderMaster.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_UPDATE_FAIL);
        }
        //TODO 微信模板 通知用户
        return orderDTO;
    }

    @Override
    @Transactional
    public OrderDTO paid(OrderDTO orderDTO) {

        //判断订单状态
        if (!orderDTO.getOrderStatus().equals(OrderStatusEnum.NEW.getCode())) {
            log.error("【订单支付完成】订单状态不正确, orderId={}, orderStatus={}", orderDTO.getOrderId(), orderDTO.getOrderStatus());
            throw new SellException(ResultEnum.ORDER_STATUS_ERROR);
        }

        //判断支付状态
        if (!orderDTO.getPayStatus().equals(PayStatusEnum.WAIT.getCode())) {
            log.error("【订单支付完成】订单支付状态不正确, orderDTO={}", orderDTO);
            throw new SellException(ResultEnum.ORDER_PAY_STATUS_ERROR);
        }


        return orderDTO;
    }
}
